Stadium: Court 2 Round: 46 Ground: Hardcourt indoor
| Challenger Knoxville | 2018/11/04 22:45 | Nathaniel Lammons v Daniel Nguyen | 6-4,3-6,6-4 |
| Challenger Charlottesville | 2018/10/27 18:30 | Mikael Ymer v Daniel Nguyen | 3-6,6-2,6-4 |
| Challenger Las Vegas | 2018/10/20 17:00 | Daniel Nguyen v Thai-Son Kwiatkowski | 2-6,3-6 |
| Challenger Fairfield | 2018/10/07 18:20 | Kevin King v Daniel Nguyen | 6-2,6-0 |
| Challenger Fairfield | 2018/10/06 21:30 | Daniel Nguyen v Dayne Kelly | 6-3,7-5 |
| Challenger Stockton | 2018/09/29 22:00 | Daniel Nguyen v Andrew Harris | 0-6,4-6 |
| Challenger Tiburon | 2018/09/22 20:15 | Daniel Nguyen v Jared Hiltzik | 4-6,7-6,1-6 |
| ITF Japan F2 | 2018/03/18 02:00 | Daniel Nguyen v Tung-Lin Wu | 6-7,7-6,7-6 |
| Challenger Stockton | 2018/09/29 20:30 | Harri Heliovaara v Ruan Roelofse | 7-6,6-1 |
| Challenger Columbus | 2018/09/15 15:20 | Tom Fawcett v Ruan Roelofse | 6-3,6-4 |
| Challenger Cary | 2018/09/08 15:20 | Alexander Sarkissian v Ruan Roelofse | 6-4,6-3 |
| Challenger Chicago | 2018/09/05 17:00 | Tommy Paul v Ruan Roelofse | 6-3,6-2 |
| Challenger Chicago | 2018/09/03 22:20 | Ruan Roelofse v Alexander Sarkissian | 3-6,4-6 |
| Challenger Chicago | 2018/09/02 22:10 | Alejandro Gonzalez v Ruan Roelofse | 4-6,6-3,3-6 |
| Challenger Chicago | 2018/09/02 17:45 | Tom Fawcett v Ruan Roelofse | 5-7,4-6 |
| Challenger Vancouver | 2018/08/11 18:20 | Ruan Roelofse v Jacob Grills | 1-6,2-6 |